SentraDMARC

BIMI: your logo in the inbox

BIMI (Brand Indicators for Message Identification) lets supporting mailbox providers show your logo next to your messages. It is available on Business and above.

Prerequisites

  • DMARC enforcing on all of your mail. Your policy must be p=quarantine or p=reject and apply to 100% of failing mail: no pct tag, or pct=100. Quarantine 25% or Reject 25% is not enough. See The enforcement ladder.
  • A logo in SVG Tiny Portable/Secure. Upload an SVG, PNG or JPG (up to 5 MB) on the BIMI page. An SVG is checked and cleaned against the profile; a PNG or JPG is traced to a vector in your browser and you approve the result. Uploading your original vector file gives the best result.
  • A mark certificate, for Gmail. Gmail shows a logo only with a Verified Mark Certificate (VMC) or a Common Mark Certificate (CMC). Only a certificate authority can issue one. Upload the PEM file your authority gives you on the BIMI page and we publish it with your logo. Some other providers show a logo without one.

Setting it up

  1. Upload your logo (and your certificate, if you have one) on the BIMI page and activate hosted BIMI.
  2. Add the CNAME the page shows at default._bimi on your domain, pointing at bimi.[your-unique-link]. Copy the real value from the page; it only starts answering once we publish your record.

After that, changing your logo or certificate is done on the BIMI page, with no further DNS edit.

What stays with you

The certificate is yours and your authority's: we host the file you upload, we cannot issue one, and its renewal (typically yearly) is done with your certificate authority. Upload the renewed file when you receive it.